The optoTTL b-12 system can be used for the optical transmission of 12 volt 16 channels digital signals or for overcoming greater distances or for eliminating problems with mass potentials. Manufactured by
Source Taidacent 3.3V 5V 12V 24V MAX323 MAX3232 DB9 RS232 Uart Level Adapter RS232 Serial Port to TTL Converter Module on m.alibaba.com
WRD-180 Double Ridge Waveguide Latching Relay Switch SPDT/DPDT, 18 GHz to 40 GHz Frequency
12v to 5v PWM/TTL USING RESISTORS - Hardware Development - V1 Engineering Forum
Z80_4500D - 12V 5A Laser & LED Buck Driver w/ Fan - TTL/PWM adjustable CC/CV | Barnett Unlimited
RS232 to TTL Serial Converter - DB9 F/M - Serial Cards & Adapters | Add-on Cards & Peripherals | StarTech.com Europe
5 V TTL Signal to 12 V Level Conversion
12V RFID Barcode 2D QR Code Reader Access Control Reader Wiegand TTL RS232 RS485 Interface - allinbest.com
DC 12V TTL 405nm 445nm 450nm Laser Diode LD Driver Board Step-down Constant Current Drive Circuit TTL Modulation Power Module - AliExpress
Laserland Power Supply Driver 450nm 445nm 473nm Blue Laser Diode TTL 12V 1.2A 50mw-1000mw
Can Bruce Abbott's inverting TTL to +/- 12V level shifter be improved to better frequency response and better matched impedance? - Electrical Engineering Stack Exchange